| pheromone | <endocrinology> A volatile hormone or behaviour modifying agent. Normally used to describe sex attractants for example bombesin for the moth Bombyx, but includes volatile aggression stimulating agents (e.g. Isoamyl acetate in honey bees). (18 Nov 1997) |
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| pheromones | Chemical substances which, when secreted by an individual into the environment, cause specific reactions in other individuals, usually of the same species. The substances relate only to multicellular organisms. This includes kairomones. Allomones are repellent pheromones. (12 Dec 1998) |